.btn{
  position: relative;
  display: inline-block;
  font-weight: $btn-font-weight;
  line-height: $btn-line-height;
  color:$body-color;
  white-space: nowrap;
  text-align: center;
  vertical-align: middle;
  background-image: none;
  border:$btn-border-width solid  transparent;
  @include  button-size($btn-padding-y, $btn-padding-x,$btn-font-size,$btn-border-radius);
 
  box-shadow:$btn-box-shadow ;
  cursor: pointer;
  transition: $btn-transition;
  &.disabled,
  &[disabled]{
    cursor: not-allowed;
    opacity: $btn-disabled-opacity;
    box-shadow: none;
    >*{
      pointer-events: none;
    }
  }
}
.btn-lg{
  @include  button-size($btn-padding-y-lg, $btn-padding-x-lg,$btn-font-size-lg,$btn-border-radius-lg);
}
.btn-md{
  @include  button-size($btn-padding-y-md, $btn-padding-x-md,$btn-font-size-md,$btn-border-radius);
}
.btn-sm{
  @include  button-size($btn-padding-y-sm, $btn-padding-x-sm,$btn-font-size-sm,$btn-border-radius-sm);
}
    
.btn-primary{
  @include button-style($primary,$primary,$white)
}
.btn-danger{
  @include button-style($danger,$danger,$white)
}
.btn-default{
  @include button-style($white,$gray-400,$body-color,$white,$primary,$primary)
}
.btn-link{
  font-weight: $font-weight-normal;
  color:$btn-link-color;
  text-decoration: $link-decoration;
  box-shadow: none;
  &:hover{
    color: $btn-link-hover-color;
    text-decoration: $link-hover-decoration;
  }
  &:focus,
  &.focus{
    text-decoration: $link-hover-decoration;
    box-shadow: none;
  }
  &:disabled,
  &.disabled{
    color: $btn-link-disabled-color;
    pointer-events: none;
  }
}